7 files declare their use of DataReferenceDefinitionInterface

EntityTypedDataDefinitionTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityTypedDataDefinitionTest.php
FieldResolver.php in core/modules/jsonapi/src/Context/FieldResolver.php
IncludeResolver.php in core/modules/jsonapi/src/IncludeResolver.php
ResourceIdentifier.php in core/modules/jsonapi/src/JsonApiResource/ResourceIdentifier.php
Tables.php in core/lib/Drupal/Core/Entity/Query/Sql/Tables.php
TemporaryQueryGuard.php in core/modules/jsonapi/src/Access/TemporaryQueryGuard.php
TypedDataDefinitionTest.php in core/tests/Drupal/KernelTests/Core/TypedData/TypedDataDefinitionTest.php

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